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LEASES - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Unrecorded Unconditional Purchase Obligation [Line Items]      
Operating lease, impairment $ 7.8 $ 5.1 $ 5.2
Operating Lease, Lease Not yet Commenced      
Unrecorded Unconditional Purchase Obligation [Line Items]      
Unrecorded unconditional purchase obligation $ 14.0